I was able to run the code you provided if I used just test.txt instead of c:\test.txt.
The file then appeared in the C:\netxms\var directory.

I then copied my batch file to this directory and it was able to be run using the following command - file.cmd "%m"

I am running the netxms service as the local admin so I am not sure if it was a permission error?

Thanks

If you wish to execute batch file, you should run CMD.EXE explicitely. Try to use command line like

cmd.exe /C "echo test >> c:\test.txt"

To pass additional information to your script, you can use same macros as in alarms (%m, %n, etc.) in action's command line.

Best regards,
Victor